Dust-separator.



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DUST SEEAhATf APf'LloAmf N FILM) 1,11;-`

Paunl ed Aa w27 y. f

of a tier of 'UNITED s'rnris PATENT oFFioE. 7

HENRY HOWARD, 0FA BOSTON, MASSACHUSETTS.

DUST-SEPARATOR.

To all whom t may concern:

Be it known that I,.HENRY HOWARD, a citizen of the vUnited States,residing at Boston, in the county of Sulfolk and State of Massachusetts,have invented certain new and useful Improvements in Dust-Separators, ofwhich the following is a speciication.

In my-Unted States Letters Patent- No. 970,053 and Reissue No. 13,090, Ihave described and claimeda method of and apparatus for separating dustfrom gases, in which a currentuof the dust-laden gases is evenlysubdivided between and caused to pass at low velocity through theinterspaces arallel dust-retaining shelves, the dust sett ing out uponthe shelves and being thence removed at intervals by a scraper, blastorsuction-pipe or other.`

means.

According to the present invention, I utilize the principle set forth inmy Specified patents, but provide inclined dust-retaining shelves andmeans for intermittently vibrating the shelves. to cause theaccumulated.

dust to slide downthem and drop into a common receptacle below.

The preferred construction is shown in the accompanying drawings, inwhichv Figure 1 is a vertical longitudinal section of the separator onthe line IwI of Fig. 2; Fig. 2 is a vertical transverse section oftheseparator on 'the line II-II of Fig. 1; and Fig. 3 isa section of therum 'and compressed-air pipe, showing ol e style of coupling the pipe tothe drumJ The apparatus illustratedicompris'es par-- allel rectangularchambers' 1-1, each of whichcontains four tiers ofllsuperposed parallelshelves 2. ber 1 is a,4 vertical gas-Supply passage 3, opening into thespaces betiNeen all of the shelves in this chamber, and `at the otherend is a vertical gas-discharge passage 4:. At the upper end ofthesupply-passage is a gas-inlet 5,- controlled by a valve 6, suspended bychain 7', and which may be raised or lowered bv the windlass 30. Abovethe valved inlets of the two chambers 1 is a horizontal passage 7, towhich the 'dustladen gases are supplied by a pipe`8. At the .lower endof the discharge passage 4 1s lan outlet 9, which delivers the euntgases into an uptake 10, having an outlet 11 com trolled by a valve l2.A horizontal passage specification of Letters recent.'

Application med December 5, 1911. serial no. 664,038.

and dust-laden gases supplied through the Patented Aug. 26,1913.

13 having a delivery pipe 14 extends over the outlets 11l of both"chambers,

In operation, the valves 6, 12 are opened pipe 8 pass into thehorizontal chamber 7 and thence through the openings 5 into they'passages 3. AThe gases then subdivide and ass-between the shelves 2,whereon the dust 1s deposited. The gases leaving the shelves enter the'discharge-passages L and escape 65 through the openings 9, uptakes 10,openings 11, horizontal passa e 13 and pipe 14.

`When heated gases and unies are sup lied to the separator, for examplethose rom metallurgical furnaces, the introduction of the heated gasesinto the upper ends of the vertical the uri ed and somewhat cooler gasesfrom the owerend of the vertical assages 4 autom'aticall effect auniform istribut-ion Aof the gases etween the spaces, because if thegases tend to flow too rapidly through the upper interspaces, vthevert-ical column-of gas in the discharge-passage acqui-resa rela- 'Ytivel l higher temperature and lower specific gravity, and thereuponeffects a back-pressure and retards the/movement ofthe gasesv betweenthe" upper shelves.

The general constructionand mode of operation 'thus far described arecommon' to my earlier specified patents. ThepresentA invention relatesto the arrangement of the shelves and to means for intermittentlyl'vibratin i them to remove the accumulated dust t erefrom. In' myearlier apparatus, the shelves are horizontal andv stationary and thedust is mechanically scraped, blown or sucked o'.' from theirsurfaces.According to my present invention the shelves 2 are transverselyinclined and are carried b'y s ports which permit themto be vibrated.'IVIien dust has accumulated on the shelves to a' certain depth, theshelves of each tier vare simultaneously agitatedl by 'suitablemechanism, and the la ers of -dust are there- 100 wardfrom azcommonintermediate su )port and vibrator. Fig. 2 illustrates in etail one ofthse pairs of tiers of :inclined assages l3 and the withdrawal of`v Inthe apparatus' vfour tiers ofshelves 2, the shelves of each pairfofadjacent tiers l being inclined downshelves, the upper .edges of which.rest 119 the shelves.

against and are supported upon a number of vertical metal tubes 15. Theshelves slope downward in opposite directions from these tubes 15, andtheir lower edges are loosely received in and supported by notches 16 ina number ol vertical metal bars 17. A longitudinal angle-'plate 18 issupported upon the adjacent edges of each pair of plates, covering thespaces between them and having openings to receive the pipes 15. Thelower are spacedaway from the lower edges of the plates the adjacenttier, vor adjacent wall, by the bars 17. Vertical longitudinal spaces,of a width equal to that of the unnotchcd portion of the bars, are thusprovided, through which the dust discharged from the shelves can fallinto longitudinal receptacles beneath. I have shown such a receptacle 2Gbeneath the lower edges of each. tier of shelves, and a screW-conveyer19 in each for discharging the dustv through one end-Wall of theseparator. The upper ends of the tubes l5 are open, to receive devicesfor vibrating the tubes and thereby The vibrating means illustratedcomprise a number of pneumatic hammers 2l of the type commonly used toknock the scale off the outside of boilertubes. These hammers have apiston-actuated piece which vibrates transversely, striking the walls ofthe tube. Five vertical tubes 15 are shown supporting each pair ofshelf-tiers, and live hammers are provided, suspended by flexiblecompressed-air pipesl 22 trom a hollow drum 23, in line with the tubes,The upper ends of the tubes 22 are connected with the chamber of thedrum by couplings 23" thereon, and this drum acts a supply-reservoir forcompressed airc The drum is journalcd in the bearings 2l of a truckwhich runs on rails Z6 at the top of the structure. One trunnion 27 ofthe drum is hollow and receives one end of a movable .:omprcssed-airsupply-pipe 28, entering through a stuliing-box.

In order to remove the accumulated dust from the shelves of eitherchamber, the valves 6, 12 of this chamber are closed, the truck carryingthe drum 23 is Wheeled over one set ot' tubes 15 and is turned to unwindthe flexible pipes 22 and drop the hammers Q1 into the tubes 15.Compressed air is supplied and the. hammers knockin upon the tubes 15vibrate the shelves an cause the dust to vslip therefrom into thevertical spaces, wherein it falls into the receptacles 530, ln bedelivered by the screw-conveyers .19, The drum is then rotated toraise'the hammers out of this set of tubes, the truck is novi-,d overthe other set of tubes 15 of the same rhamber, and the hammers aredropped therein and vibrated, thus clearing the dust from the other twotiers of shelves in this chamber,

edges of the plates of each tierv It will be understood that electric orother equivalent means may be used to support and vibrate th shelves,instead of the tubes 15 and pneumatic hammers.V

I claim: v

1. A dust-separator, comprising'a chamber containing superposedtransversely inclined dust-retaining shelves, means for passingdust-laden gases between Said shelves, and means for vibratingptheshelves to discharge the accumulated dust therefrom.

2. A dust-separator, comprising a cham- -ber containingsuperposedtransversely inclined dust-retaining shelves, vertical gasinlet andoutlet passages at the opposite ends of said shelves, a verticaldust-receiving passage communicating with the lower ends of saidshelves, and means for vibrating said shelves 3. A dust-separator,comprising a chamber containing superposed inclined dustretainingshelves,vmcans for passing dustladen gasesbetween said shelves, avertical support for said shelves, and means for vibrating saidl,support and thereby the shelves.

, 4. A. dust-separator, comprisinga cham-l ber containing superposedinclined .dustretaining shelves, means for passing dustladen gasesbetween said shelves, a vertical tubular support for said shelves, andmeans constructed to enter and vibrate said support and thereby theshelves.

A, dust-separator, comprisingl a series el superposed inclineddust-retaining shelves, means for between said shelves, a series ofvertical supports for said shelves, and means for simultaneouslyvibrating said supports.

t5. A dust-separator, comprising a plurality of tie'rs ol superposedinclined dustretaining shelves, means for passing dustladen gasesbetween said shelves, series of vertical tubular supports for differenttiers of shelves, and a movable set of devices adapted lo enter andvibrate any series of supports and the shelves carried thereby.

7. vA dust-separator, comprising a plurality of tiers of superposedinclined dustretaining shelves, means for passing dustladen gasesbetween said shelves, series of vertical tubular supports for differenttiers of shelves, a series of pneumatic hammers adapted to enter andvibrate any series of supports and a movable compressed-air drum havingflexible depending air-pipes carrying said hammers i 8. A dust-separatorcomprising a chamber containing closely-spaced, superposed, inclined,dustretaining shelves, means for passing gases of super-atmospherietemperaturc tl'iercllu'ough, means for, vibrating the shelves, and meansfor automatically regulating the passage of the gases to secure passingdust-laden gases Substantial uniformity of flow between the shelves(l9..A dust-separator, comprising a chamber containing superposed inclineddustretaining shelves, means for vibrating said shelves; passagesat theopposite ends of said shelves, an inlet'at the upper end of one passa e,and an outlet at the lower end of the ot er passage, whereby asubstantial uni- 'formity of flow is secured between thc shelves abovethe outlet.

- 10. A dust-separator, comprising a plurality of chambers eachcontaining superposed inclined dust-retaining shelves, means for passingdust-laden gases between said shelves, and means for isolating eachchamber and vibrating the shelyes therein to discharge the accumulateddust therefrom.

11. A dust-separator, comprising a plurality of chambers, eachcontaining closely spaced, superposed, inclined, dust-retaining shelves,means for passing gases of super atmospheric temperature therethrough,means for automatically regulating the passage of the ases to securesubstantial uniformity yof ow between the shelves, and

means for isolating each chamber and vibrating the shelves therein todischarge the accumulated dust therefrom.

12. A dust collector comprising a chamber, having a gas inlet and anoutlet, containing a plurality of series, in zigzag arrangement, of dustretaining shelves, inclined transversely to the direction of fiow of thegas, rods supporting the contiguous upper ends of the plates of adjacentseries, said rods communicatin with the outside of the chamber so thatvi rations from an external source may be transmitted therethrough tothe plates for dislodging dust accumulated thereon, and, a support forthe lower ends of the plates of adjacent series, separating said seriesand thereby forming an alley way toward which the plates slope, saidsupport constituting a partition in said alley way to prevent thepassage of gas therethrough.

In testimony whereof I ax my signature in presence of two witnesses.

s HENRY HOWARD. Witnesses:

EDWIN R. BOND, W. B. KEi'rH.

closely spaced, super-posed, y

